linux-kernel - Re: [PATCH 1/2] hugetlb: properly account rss

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Date:	Fri, 28 Jun 2013 15:03:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joern Engel <joern@...fs.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] hugetlb: properly account rss

On Tue, 18 Jun 2013 14:47:04 -0400 Joern Engel <joern@...fs.org> wrote:

> When moving a program from mmap'ing small pages to mmap'ing huge pages,
> a remarkable drop in rss ensues.  For some reason hugepages were never
> accounted for in rss, which in my book is a clear bug.  Sadly this bug
> has been present in hugetlbfs since it was merged back in 2002.  There
> is every chance existing programs depend on hugepages not being counted
> as rss.
> 
> I think the correct solution is to fix the bug and wait for someone to
> complain.  It is just as likely that noone cares - as evidenced by the
> fact that noone seems to have noticed for ten years.
> 

Yes, that is a concern.  I'll toss it in there so we can see what
happens, but I fear that any problems will take a long time to be
discovered.
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